Wireless Bluetooth Featured with CVC6.0 noise cancelling technology, the Bluetooth headphone intelligently filters out background noise in busy and noisy environments. The latest Bluetooth 4.1 chipset with more steady Bluetooth signal is adopted to facilitate free connection to mobile phone, tablet, PC and other Bluetooth devices. Design for Sport. The ultra-light and ultra-small structure will comfort and set free your ears. The Bluetooth headset has mic functionality, so you don’t have to stop working out to answer calls. Control calls design makes Hands Free Calling and Easy Controls for volume, skip, pause and play. Supports voice commands on Apple devices (Siri) – so you can make calls or search the web on the run without touching your phone Pair with 2 Bluetooth devices at the same time (Note: only one of them can play music or make phone calls with the headphones at one time). IPX5 waterproof / sweatproof protection. Long Endurance 120mAh battery provides up to 9 hours of playing and 240 hours of standby time. 2 times longer than that of normal Bluetooth headsets. Specifications Bluetooth Specification: 4.1+EDR Transmission Distance: 33ft Battery: Lithium-ion Polymer 120mAh Endurance: 9 hours Standby Time: 240 hours Charging Port: Micro USB Charge Time: 1.5-2 hours Earphone Cable Length: 56cm(1.8ft) Charging Cable Length: 18.5cm(7.25 inches)